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Dammarane-Type Triterpenoids from the Stembark of Aglaia Argentea (Meliaceae)

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Dammarane-Type Triterpenoids from the Stembark of Aglaia Argentea (Meliaceae) Jurnal Kimia VALENSI: Jurnal Penelitian dan Pengembangan Ilmu Kimia, 4(1), Mei 2018, 7-13 Available online at Website: http://journal.uinjkt.ac.id/index.php/valensi Dammarane-Type Triterpenoids from The Stembark of Aglaia argentea (Meliaceae) Ace Tatang Hidayat1,2, Kindi Farabi1, Ida Nur Farida2, Kansy Haikal2, Nurlelasari1, Desi Harneti1, Rani Maharani1,2, Unang Supratman1,2, Yoshihito Shiono3 1Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor 45363, Indonesia 2Central Laboratory of Universitas Padjadjaran, Jatinangor 45363, Indonesia 3Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata 997-8555, Japan E-mail: [email protected] Received: January 2018; Revised: February 2018; Accepted: February 2018; Available Online: May 2018 Abstract Two dammarane-type triterpenoids, 20S,24S-epoxy-3α,25-dihydroxydammarane (1) and 3α-acetyl-20S,24S- epoxy-3α,25-dihydroxydammarane (2), have been isolated from the stembark of Aglaia argentea. The chemical structure of compounds (1 and 2) were identified by spectroscopic evidences including UV, IR, 1D-NMR, 2D- NMR and MS as well as by comparing with previously reported spectral data. Those compounds were isolated from this plant for first time. Compounds (1 and 2) showed cytotoxic activity against P-388 murine leukemia cells with IC50 values of 23.96 and 8.14 M, respectively. Keywords: Aglaia argentea, Aglaia, dammarane-type triterpenoids, Meliaceae, P-388 Murine leukemia cells. DOI: http://dx.doi.org/10.15408/jkv.v4i1.7065 1. INTRODUCTION and C-24, a five-membered lactone ring usually appears between C-21 and C-23, and a Dammarane-type triterpenoids widely six-membered ring with epoxy bond displays distributed in various medicinal plants and between C-20 and C-25 for dammarane-type have a great amount of interest in the field of triterpenoids (Phan et al., 2011). They are new drug research and development (Zhao et usually classified into protopanaxdiol and al., 2007). Dammarane-type triterpenoids protopanaxtriol (with 6-OH) groups based on belong to tetracyclic ring triterpenoids and their aglycone moieties. Furthermore, in their structural characteristic is with H-5α, pharmacological research, dammarane-type triterpenoids, as well as their derivatives, CH3-8, H-9α, CH3-10β, H-13β, CH3-14α, C-17β side chain, and 20R or S configuration showed various bioactivities such as antitumor, and usually, C-3, C-6, C-7, C-12, C-20, C-23, antiinflammatory, immunostimulatory, C-24, or C-25 are replaced by hydroxyl group; neuronal cell proliferatory, antiaging, C-3, C-6, or C-20 are substituted by saccharide antibacterial, antidiabetes, and antiosteoporosis groups and olefinic bond are formatted abilities (Jin et al., 2011). between C-5 and C-6, C-20 and C-21, C-20 The genus Aglaia is the largest genus and C-22, C-22 and CC-23, C-24 and C-25 or of the family of Meliaceae comprises more C-25 and C-26 (Liu et al., 2011). Moreover, than 100 species distributed mainly in India, cyclization generally displays at C17-side Indonesia, Malaysia, and parts of the Western chain. Specifically, a five-membered ring with Pacific region (Leong et al., 2016). Some epoxy bond is usually formed between C-20 species of Aglaia have been phytochemically investigated previously with major constituents Copyright©2018, Published by Jurnal KimiaVALENSI: Jurnal Penelitian dan Pengembangan Ilmu Kimia, P-ISSN: 2460-6065, E-ISSN: 2548-3013 Jurnal Kimia VALENSI, Vol. 4, No. 1, Mei 2018 [7-13] P-ISSN : 2460-6065, E-ISSN : 2548-3013 of dammarane-type triterpenoids (Zhang et al., suspended to water (500 mL) and successively 2010; Harneti et al., 2012) and cycloartane- extracted with n-hexane (2×1 L), ethyl acetate type triterpenoids (Awang et al., 2012; Leong (2×1 L) and n-butanol (2×1 L) to afford n- et al., 2016) and glabretal-type triterpenoids hexane (27 g), ethyl acetate (16 g) and n- (Su et al., 2006). In our continous search for BuOH (36 g) extracts, respectively. The n- novel secondary metabolites from Indonesian hexane soluble fraction (26.3 g) was separated Aglaia plants, we isolated and described by vacum liquid chromatography on silica gel triterpenoids, aglinone and aglinin E, from the 60 using a gradient n-hexane and EtOAc to bark of A. smithii (Harneti et al., 2012), and give nine fractions (A–I). Fraction B (2.50 g) protolimonoid from the stembark of was chromatographed on a column of silica A. argentea (Farabi et al., 2017). In the further gel, eluted with a gradient of n-hexane–EtOAc screening for novel triterpenoid compounds (10:0–1:1), to give six subfractions (C01– from Indonesia Aglaia plants, we found that C06). Subfraction C03 (250 mg) was the n-hexane of A. argentea exhibited the chromatographed on a column of silica gel, presence of triterpenoids. We report herein the eluted with CH2Cl2:CHCl3 (9.5:0.50), to give isolation, structural elucidation of dammarane- five subfractions (C03A-C03D). Subfraction type triterpenoid compounds (1-2). C03C was separated on preparative TLC on silica gel GF254, eluted with n-hexane:EtOAc 2. MATERIAL AND METHODS (8.5:1.5), to give 1 (15.2 mg). Fraction C and D were combined (1.80 g) and was General Experimental Prosedure chromatographed on a column of silica gel, Melting points were measured on an eluted with a gradient of n-hexane–EtOAc electrothermal melting point apparatus and are (10:1–1:10), to give seven subfractions (D01– uncorrected. The IR spectra were recorded on D07). Subfraction D05 (340 mg) was a Perkin-Elmer spectrum-100 FT-IR in KBr. chromatographed on a column of silica gel, Mass spectra were obtained with a Synapt G2 eluted with a gradient of n-hexane–EtOAc mass spectrometer instrument. NMR data (10:1–1:10) to afford four subfractions (D05A- were recorded on a JEOL ECZ-600 D05D). Subfraction D05C was spectrometer at 600 MHz for 1H and 150 MHz chromatographed on a column of silica gel, 13 for C and JEOL JNM A-500 spectrometer at eluted with a gradient of CHCl3–EtOAc (10:1– 500 MHz for 1H and 150 MHz for 13C, 1:10) to give 2 (10.5 mg). chemical shifts are given on a (ppm) scale and tetramethylsilane (TMS) as an internal 3. RESULTS AND DISCUSSION standard. Column chromatography was conducted on silica gel 60 (Kanto Chemical The methanolic extract from the dried Co., Inc., Japan). TLC plates were precoated stembark of A. argentea was concentrated and with silica gel GF254 (Merck, 0.25 mm) and extracted successively with n-hexane, ethyl detection was achieved by spraying with 80% acetate, and n-butanol. The n-hexane exhibited H2SO4 in water, followed by heating. the presence of triterpenoid compounds. By using triterpenoid test to guide separations, the Plant Material n-hexane fraction was separated by The stembark of A. argentea were combination of column chromatography on collected in Bogor Botanical Garden, Bogor, silica gel and preparative TLC on silica gel West Java Province, Indonesia in June 2015. GF254 to afford two dammarane-type The plant was identified by the staff of the triterpenoids (1-2). Bogoriense Herbarium, Bogor, Indonesia and a voucher specimen (No. Bo-1288718) was 20S,24S-epoxy-3α,25-dihydroxydammarane deposited at the Herbarium. (1) White crystal, melting points 166-167 Extraction and Isolation °C; IR (KBr) vmax 2866, 3457, 1457, 1380, -1 1 13 The dried and powdered of A. 1055 cm ; H-NMR (CDCl3, 600 MHz), C- argentea (2.5 kg) was extracted with methanol NMR (CDCl3, 150 MHz), See Table 1; ESI- + (14 L) at room temperature for 5 days. After MS m/z 461.36 [M+H] , (calcd. for C30H52O3 removing the solvent, the methanol extract m/z 460.39). (133.5 g) was recovered. The extract was then 8 Dammarane-Type Triterpenoids from the Stembark of Aglaia argentea (Meliaceae) Hidayat, et. al. 3 3α-acetyl-20S,24S- epoxy-3α,25- oxygenated sp methine at H 3.38 (1H, t, dihydroxydammarane (2) J=3.0 Hz) and an oxygenated sp3 methine in Solid amorphous powder; IR (KBr) part of tetrahydrofuran ring at H 3.62 (1H, dd, -1 1 vmax 3200, 2949, 1705, 1457, 1380, 1080 cm ; J=4.8, 10.2 Hz) were also obsereved in the H- 1 13 H-NMR (CDCl3, 500 MHz); C-NMR NMR spectra, supporting the presence of (CDCl3, 125 MHz), see Table 1; HR-TOFMS dammarane-type triterpenoid structure in - m/z 501.3770 [M-H] , (calcd. for C32H54O4 m/z compound (1) (Roux et al., 1998). 502,4022). 13C-NMR spectrum of (1) showed thirty carbon resonances which were classified by their chemical shifts and the DEPT spectrum as eight methyls, ten methylenes, six methines and six quarternary carbons, indicating the presence of dammarane-type triterpenoid (Harneti et al., 2014). The presence of eight methyl resonances at C15.6 (CH3-30), 16.2 (CH3-18), 16.6 (CH3-19), 22.2 (CH3-28), 24.1 (CH3-26), 27.3 (CH3-21), 27.9 (CH3-27), and 28.4 (CH3-29), as well as two oxygenated quartenary carbon at C 86.7 and 70.3, supporting the presence of dammarane- type triterpenoid with addition of tetrahydrofuran ring (Roux et al., 1998). In order to clarify the position of functional groups in compound (1), 1H-1H COSY and HMBC experiments were carried out and the results was shown in Figure 1. The 1H-1H COSY spectrum of 1 displayed the correlations in C1-C2-C3, C5-C6-C7, C9-C11-C12- C13, C14-C15-C16-C17, and C22-C23-C24, supporting the presence of dammaran-type triterpenoid structure in (1). In the HMBC spectrum, the correlations arising from the tertiary methyl protons to their neighboring carbons enabled the assignment of the eight Compound (1) was isolated as a white o singlet methyls at C-4 (2), C-8, C-10, C-14, needle crystal, melting points, 166-167 C.
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